(Proverbs 10:26 KJV) As vinegar to the teeth, and as smoke to the eyes, so is the sluggard to them that send him.
As I looked at the context I noticed that this verse had a different pattern than the two surrounding it. As I looked a little further I saw that the two forms are mixed through the chapter. Some of the verses contrast two thoughts. This continues or elaborates on the first idea.
The issue being addressed is sloth, one of the seven deadly sins. The NASB uses the modern term of “lazy” (6102). I say modern because it does not seem to appear in the KJV, which here uses “sluggard”. The danger is more than being slow. It is a slowness that is caused by a lack of focus and application. Think of the tale of the Tortoise and the Hare. The hare was very quick but did not apply himself. The tortoise was slow but always working toward the goal.
So? Are you frustrated because you are not the horse with the fancy saddle? Maybe God needs a sure footed donkey to get the job done.